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Wyszukujesz frazę "Szymczak, E." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Methods of data extraction from sub-bottom profiler’s signal
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/331949.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Data obtain during sounding Gdańsk Bay with SES-2000 Standard parametric sub-bottom profiler has two types of information: envelope and pure signal. First is used to plot echograms in real time and contain envelope of echo. The second one is stored during sounding and can be processed after recording data. Comparison of results will be shown and discussed. First step in investigation was proper configuration of small measurement vessel detailing localization of echosounder antennas and perypherical units (GPS, heading, motion sensor MRU-Z and navigation devices) complementing information of measurement system. There are different types of research (for example looking for buried objects or investigation of sediments layers) which require separate configuration of software working with sub-bottom profiler. Various settings will be presented and interrelated with real data. Very important in work with stored sounding data is proper post-processing realized with software dedicated to parametric echosounder SES-2000 standard and Matlab which give possibility of clear presentation in 3D with precise measurement methods what will be presented on echograms coming from works on sea in 2009 year.
    Źródło:
    Hydroacoustics; 2010, 13; 109-118
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic imaging of selected areas of Gdansk Bay with the aid of parametric echosounder and side-scan sonar
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/963410.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    echolocation
    acoustic imaging
    seabed structure examination
    Opis:
    The article presents and analyses the data recorded during sounding of the Gdansk Bay seabed with the aid of a parametric echosounder and a side-scan sonar. The accuracy of seabed structure examination, as a condition for obtaining valuable results, requires correct configuration of echolocation devices and proper calibration of peripheral devices, such as the survey unit geographical position sensor – GPS, the navigation unit, the MRU-Z sensor of pitch, roll and heave, and the sound velocity meter, which deliver the data to the bathymetric measurement system. Parametric seabed profilers deliver two types of data: the envelope, and the detailed echo signal without processing. The envelope is used for data visualisation in the form of online echograms, while the echo signal is stored for further analyses, to be performed using dedicated software or, after relevant conversion, in arbitrary programming environment1. The presented data analysis is illustrated by selected sample images recorded by the parametric echosounder and the side-scan sonar during Gdansk Bay sounding.
    Źródło:
    Polish Maritime Research; 2017, 4; 35-41
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diver Observations by Means of Acoustic Methods
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400100.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.30.Vh
    43.30.Wi
    43.66.Qp
    Opis:
    Searching for objects, especially small ones, moving under water near its the free surface, is always not an easy task. Designing tools for the detection of such targets is a real challenge when the possibility of a terrorist attack is a real threat. This paper presents some aspects of diver detection by means of acoustics methods, both active (side scan sonar) and passive ones (linear receiving antenna). This approach is quite effective because divers can use both breathing apparatus operating in the closed-loop (so-called rebreathers), and popular open-circuit breathing (exhalation of used air or a breathing gas mixture into the water).
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1098-1100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Examination of the Upper Layers of the Seabed by the Means of the Acoustic Methods
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Szymczak, W.
    Kozaczka, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504447.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.30.Ma
    43.30.Pc
    43.25.Jh
    Opis:
    Propagation of acoustic waves in the sea, in particular in shallow sea, depends on several factors. The basic of them are source power and frequency of acoustic waves, spatial distribution inhomogeneous medium in which acoustic wave propagates, and distributions of speed of sound and density of seawater. The coastal conditions, which limit water medium from above (free surface of the sea) and from bottom (the seabed), are no less important. In this paper we will consider the examination of the layer structure of the seabed by the means of the acoustic methods. By the notion of acoustic methods we mean use of phenomena in the field of nonlinear hydroacoustics. Based on this, the parametric sonar was constructed and was used to the seabed sounding. This parametric sonar is commonly called sub-bottom profiler. The selected results of extensive experimental research, that have been performed in waters of the Gulf of Gdańsk in the years 2008-2010, will be presented in this work.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6A; 1091-1094
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gdansk Bay sea bed sounding and classification of its results
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/258594.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sea bed sounding
    parametric sub-bottom profiler
    sea bed structure
    Opis:
    The main goal of this paper is to describe the results of sounding the Gdansk Bay sea bed by using a SES- 2000 Standard parametric sub-bottom profiler. Quality of data obtained during trials depends inter alia on a proper location of transducer array to reduce influence of pitch, roll and heave motions as well as ship self noise (resulting from bubbles due to propeller and flow around hull, vibration generated by main engine and auxiliary devices). Furthermore, calibration of complementary units such as GPS, heading sensor, MRU-Z motion sensor and navigation devices make sea-bed investigating system capable of working with its whole capability. Results of so prepared surveys have been presented and discussed. They contain also an elaborated map of Gdansk Bay with preliminarily classified sea-bed materials and description of most interesting areas.
    Źródło:
    Polish Maritime Research; 2013, 3; 45-50
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing data on sea bottom structure obtained by means of the parametric sounding
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259876.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sea bottom acoustic
    sub-bottom profiler
    sea bed structure
    Opis:
    The aim of the paper is to analyze data obtained during sounding the Gdansk Bay sea bed by means of the parametric echo-sounder. The accuracy of the sea bottom structure investigation needs correct configuration of research equipment and proper calibration of peripheral devices (GPS, heading sensor, MRU-Z motion sensor and navigation instruments which provide necessary data to bathymetrical measurement system, enabling its work with full capability. The parametric sub-bottom profiler delivers two types of data which include different information: envelope and pure echo signal sampled without processing. The first is used to present echograms in real time and the second one is stored during sounding and the obtained data can be analyzed by using post-processing software. Differences in the results are presented and discussed. And, are described also criteria taken into account during determination of the measurement areas and selection of different configurations of the software according to the information to be obtained from trials. Complementary information can be achieved from processing the data by means of the procedures offered by Matlab software, which allows for a clear 3D presentation of the results. The consideration are illustrated by echograms taken in the natural conditions.
    Źródło:
    Polish Maritime Research; 2012, 4; 3-10
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of Objects Buried in the Sea Bottom with the Use of Parametric Echosounder
    Autorzy:
    Kozaczka, E.
    Grelowska, G.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/177224.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sea bottom
    sea bottom acoustic
    buried objects
    Opis:
    The paper contains results of a in situ research main task of which was to detect objects buried, partially or completely, in the sea bottom. Object detecting technologies employing acoustic wave sources based on nonlinear interaction of elastic waves require application of parametric sound sources. Detection of objects buried in the sea bottom with the use of classic hydroacoustic devices such as the sidescan sonar or multibeam echosounder proves ineffective. Wave frequencies used in such devices are generally larger than tens of kHz. This results in the fact that almost the whole acoustic energy is reflected from the bottom. On the other hand, parametric echosounders radiate waves with low frequency and narrow beam patterns which ensure high spatial resolution and allows to penetrate the sea bottom to depths of the order of tens of meters. This allows to detect objects that can be interesting, among other things, from archaeological or military point of view.
    Źródło:
    Archives of Acoustics; 2013, 38, 1; 99-104
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Underwater Noise Generated by a Small Ship in the Shallow Sea
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Kozaczka, S.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/177360.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signal processing
    sound propagation
    underwater ship noise
    propagation in the shallow sea
    Opis:
    Study of the sea noise has been a subject of interest for many years. The first works in this scope were published at the turn of the twentieth century by Knudsen (Knudsen et al., 1948) and G. Wenz (Wenz, 1962). Disturbances called “shipping noise” are one of the important components of the sea noise. In this work the results of an experimental research of underwater noise produced by a small ship of a classic propulsion are presented. A linear receiving antenna composed of two orthogonal components was used in the investigation. Identification of the main sources of acoustic waves related with the ship was achieved. In addition, the intensity of the wave was measured. The research was performed in conditions of the shallow sea.
    Źródło:
    Archives of Acoustics; 2013, 38, 3; 351-356
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The imaging of Gdansk Bay seabed by using side sonar
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Witos-Okrasińska, D.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259025.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Gdańsk Bay seabed
    side sonar
    hydro-acoustic systems in waters
    Opis:
    This paper is mainly aimed at presentation of an impact of environmental conditions on imaging accuracy by using hydro-acoustic systems in waters of a high non-uniformity of spatial distribution of hydrological parameters. Impact of refraction on erroneous estimation of range, in case of wave radiation into water under a large angle, like in side sonars or multi-beam echo-sounders, is especially important. In this paper seasonal changes in sound speed and its impact on acoustic beam refraction is discussed. And, examples which illustrate errors in determination of side sonar range occurred during last investigations carried out in Gdansk Bay waters are presented.
    Źródło:
    Polish Maritime Research; 2018, S 1; 111-118
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Transmit and Receive Characteristics of Laboratory Model for the Parametric Echosounder
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Nowicki, A.
    Kozaczka, S.
    Szymczak, W.
    Tymkiewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400099.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.30.Ma
    43.30.Pc
    43.25.Jh
    Opis:
    Investigation and operation of devices based on nonlinear interaction of high-intensity waves have been carried out for several decades. However, it is still a new tool to study the properties of the water environment and especially the upper layers of the seabed. This paper describes the results of tests of the new device that is intended to be applied for sounding underwater areas. The device has been designed and built in collaboration with the Department of Ultrasound of the Institute of Fundamental Scientific Researches of the Polish Academy of Sciences in Warsaw.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1094-1097
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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